Vascular endothelial cell distribution and adhesion molecule expression in xanthoma

Area of Science:

• Dermatology
• Immunology
• Cell Biology

Background:

• Monocyte migration into the dermis is crucial for xanthoma initiation and progression.
• The role of vascular endothelial cells in monocyte migration during xanthoma is not well understood.

Purpose of the Study:

• To investigate the role of endothelial cells and their associated molecules in xanthoma pathogenesis.
• To compare endothelial cell markers in xanthoma lesions versus normal skin.

Main Methods:

• Immunohistochemical staining was performed on 20 xanthelasma and 6 tuberous xanthoma lesions.
• Analysis focused on the expression of von Willebrand factor, E-selectin, and intercellular cell adhesion molecule-1 (ICAM-1) on endothelial cells.

Main Results:

• Xanthoma lesions showed a 25-fold increase in von Willebrand factor-positive endothelial cells compared to normal skin.
• E-selectin-positive endothelial cells were threefold more prevalent in xanthoma lesions, while ICAM-1 expression decreased by 3.5-fold.
• A higher ratio of macrophages to endothelial cells (10:1) was observed in xanthoma lesions compared to normal skin (5:1).

Conclusions:

• Endothelial cells in xanthoma lesions proliferate and express E-selectin, not ICAM-1, in a macrophage-rich environment.
• This altered endothelial cell expression promotes further macrophage migration into xanthoma lesions.
• The findings highlight a shift in endothelial cell behavior that contributes to xanthoma progression.